KANDEN ENGINEERING CORPORATION

KANDEN ENGINEERING CORPORATION Patent applications

Patent application number

Title

Published

20130204827

INTERNAL ABNORMALITY DIAGNOSIS METHOD, INTERNAL ABNORMALITY DIAGNOSIS SYSTEM, AND DECISION TREE GENERATION METHOD FOR INTERNAL ABNORMALITY DIAGNOSIS OF OIL-FILLED ELECTRIC APPARATUS UTILIZING GAS CONCENTRATION IN OIL - An object is to provide an internal abnormality diagnosis method, an internal abnormality diagnosis system and a decision tree generation method for internal abnormality diagnosis of an oil-filled electric apparatus utilizing gas concentration in oil and having a diagnostic accuracy equal to or higher than that of a diagnostic specialist having reached a certain level. The present invention provides a method for generating a decision tree for determining the type of an internal abnormality of an oil-filled electric apparatus using a computer. In the decision tree generation method, the computer generates a standardized data group by converting concentrations of a plurality of gas species dissolved in an insulating oil in an oil-filled electric apparatus into ratios for each abnormality case, generates a discretized data group by converting the ratios of the concentrations of the gas species, the ratios constituting the standardized data group, into a plurality of discretized attributes using predetermined thresholds which are set for the respective gas species, and generates a decision tree for determining the type of an internal abnormality of the oil-filled electric apparatus by analysis using specific formulae on the basis of the discretized data group.